summaryrefslogtreecommitdiff
path: root/mailnews/imap/src/nsImapUndoTxn.cpp
blob: 8d51dab359059fb36a6e45d62f141e35c37636e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "msgCore.h" // for precompiled headers
#include "nsMsgImapCID.h"
#include "nsIMsgHdr.h"
#include "nsImapUndoTxn.h"
#include "nsIIMAPHostSessionList.h"
#include "nsIMsgIncomingServer.h"
#include "nsImapMailFolder.h"
#include "nsIDBFolderInfo.h"
#include "nsIMsgDatabase.h"
#include "nsMsgUtils.h"
#include "nsThreadUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"

nsImapMoveCopyMsgTxn::nsImapMoveCopyMsgTxn() :
    m_idsAreUids(false), m_isMove(false), m_srcIsPop3(false)
{
}

nsresult
nsImapMoveCopyMsgTxn::Init(nsIMsgFolder* srcFolder, nsTArray<nsMsgKey>* srcKeyArray,
                           const char* srcMsgIdString, nsIMsgFolder* dstFolder,
                           bool idsAreUids, bool isMove)
{
  m_srcMsgIdString = srcMsgIdString;
  m_idsAreUids = idsAreUids;
  m_isMove = isMove;
  m_srcFolder = do_GetWeakReference(srcFolder);
  m_dstFolder = do_GetWeakReference(dstFolder);
  m_srcKeyArray = *srcKeyArray;
  m_dupKeyArray = *srcKeyArray;
  nsCString uri;
  nsresult rv = srcFolder->GetURI(uri);
  nsCString protocolType(uri);
  protocolType.SetLength(protocolType.FindChar(':'));
  nsCOMPtr<nsIMsgDatabase> srcDB;
  rv = srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
  NS_ENSURE_SUCCESS(rv, rv);
  uint32_t i, count = m_srcKeyArray.Length();
  nsCOMPtr<nsIMsgDBHdr> srcHdr;
  nsCOMPtr<nsIMsgDBHdr> copySrcHdr;
  nsCString messageId;

  for (i = 0; i < count; i++)
  {
    rv = srcDB->GetMsgHdrForKey(m_srcKeyArray[i],
      getter_AddRefs(srcHdr));
    if (NS_SUCCEEDED(rv))
    {
      // ** jt -- only do this for mailbox protocol
      if (MsgLowerCaseEqualsLiteral(protocolType, "mailbox"))
      {
        m_srcIsPop3 = true;
        uint32_t msgSize;
        rv = srcHdr->GetMessageSize(&msgSize);
        if (NS_SUCCEEDED(rv))
          m_srcSizeArray.AppendElement(msgSize);
        if (isMove)
        {
          rv = srcDB->CopyHdrFromExistingHdr(nsMsgKey_None, srcHdr, false,
                                             getter_AddRefs(copySrcHdr));
          nsMsgKey pseudoKey = nsMsgKey_None;
          if (NS_SUCCEEDED(rv))
          {
            copySrcHdr->GetMessageKey(&pseudoKey);
            m_srcHdrs.AppendObject(copySrcHdr);
          }
          m_dupKeyArray[i] = pseudoKey;
        }
      }
      srcHdr->GetMessageId(getter_Copies(messageId));
      m_srcMessageIds.AppendElement(messageId);
    }
  }
  return nsMsgTxn::Init();
}

nsImapMoveCopyMsgTxn::~nsImapMoveCopyMsgTxn()
{
}

NS_IMPL_ISUPPORTS_INHERITED(nsImapMoveCopyMsgTxn, nsMsgTxn, nsIUrlListener)

NS_IMETHODIMP
nsImapMoveCopyMsgTxn::UndoTransaction(void)
{
  nsresult rv;
  nsCOMPtr<nsIImapService> imapService = do_GetService(NS_IMAPSERVICE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  bool finishInOnStopRunningUrl = false;

  if (m_isMove || !m_dstFolder)
  {
    if (m_srcIsPop3)
    {
      rv = UndoMailboxDelete();
      NS_ENSURE_SUCCESS(rv, rv);
    }
    else
    {
      nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
      if (NS_FAILED(rv) || !srcFolder) 
        return rv;
      nsCOMPtr<nsIUrlListener> srcListener = do_QueryInterface(srcFolder, &rv);
      if (NS_FAILED(rv)) 
        return rv;
      m_onStopListener =   do_GetWeakReference(srcListener);

      // ** make sure we are in the selected state; use lite select
      // folder so we won't hit performance hard
      rv = imapService->LiteSelectFolder(srcFolder, srcListener, nullptr, nullptr);
      if (NS_FAILED(rv)) 
        return rv;
      bool deletedMsgs = true; //default is true unless imapDelete model
      nsMsgImapDeleteModel deleteModel;
      rv = GetImapDeleteModel(srcFolder, &deleteModel);

      // protect against a bogus undo txn without any source keys
      // see bug #179856 for details
      NS_ASSERTION(!m_srcKeyArray.IsEmpty(), "no source keys");
      if (m_srcKeyArray.IsEmpty())
        return NS_ERROR_UNEXPECTED;

      if (!m_srcMsgIdString.IsEmpty())
      {
        if (NS_SUCCEEDED(rv) && deleteModel == nsMsgImapDeleteModels::IMAPDelete)
          CheckForToggleDelete(srcFolder, m_srcKeyArray[0], &deletedMsgs);

        if (deletedMsgs)
          rv = imapService->SubtractMessageFlags(srcFolder,
                                                 this, nullptr,
                                                 m_srcMsgIdString, 
                                                 kImapMsgDeletedFlag,
                                                 m_idsAreUids);
        else
          rv = imapService->AddMessageFlags(srcFolder,
                                            srcListener, nullptr,
                                            m_srcMsgIdString,
                                            kImapMsgDeletedFlag,
                                            m_idsAreUids);
        if (NS_FAILED(rv)) 
          return rv;

        finishInOnStopRunningUrl = true;
        if (deleteModel != nsMsgImapDeleteModels::IMAPDelete)
          rv = imapService->GetHeaders(srcFolder, srcListener, nullptr,
                                       m_srcMsgIdString, true);
      }
    }
  }
  if (!finishInOnStopRunningUrl && !m_dstMsgIdString.IsEmpty())
  {
    nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
    if (NS_FAILED(rv) || !dstFolder)
      return rv;

    nsCOMPtr<nsIUrlListener> dstListener;

    dstListener = do_QueryInterface(dstFolder, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    // ** make sure we are in the selected state; use lite select folder
    // so we won't potentially download a bunch of headers.
    rv = imapService->LiteSelectFolder(dstFolder,
      dstListener, nullptr, nullptr);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = imapService->AddMessageFlags(dstFolder, dstListener,
                                      nullptr, m_dstMsgIdString, 
                                      kImapMsgDeletedFlag, m_idsAreUids);
  }
  return rv;
}

NS_IMETHODIMP
nsImapMoveCopyMsgTxn::RedoTransaction(void)
{
  nsresult rv;
  nsCOMPtr<nsIImapService> imapService = do_GetService(NS_IMAPSERVICE_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  if (m_isMove || !m_dstFolder)
  {
    if (m_srcIsPop3)
    {
      rv = RedoMailboxDelete();
      if (NS_FAILED(rv)) return rv;
    }
    else if (!m_srcMsgIdString.IsEmpty())
    {
      nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
      if (NS_FAILED(rv) || !srcFolder) 
        return rv;
      nsCOMPtr<nsIUrlListener> srcListener = do_QueryInterface(srcFolder, &rv);
      NS_ENSURE_SUCCESS(rv, rv);

      bool deletedMsgs = false;  //default will be false unless imapDeleteModel;
      nsMsgImapDeleteModel deleteModel;
      rv = GetImapDeleteModel(srcFolder, &deleteModel);
      
      // protect against a bogus undo txn without any source keys
      // see bug #179856 for details
      NS_ASSERTION(!m_srcKeyArray.IsEmpty(), "no source keys");
      if (m_srcKeyArray.IsEmpty())
        return NS_ERROR_UNEXPECTED;
      
      if (NS_SUCCEEDED(rv) && deleteModel == nsMsgImapDeleteModels::IMAPDelete)
        rv = CheckForToggleDelete(srcFolder, m_srcKeyArray[0], &deletedMsgs);
      
      // Make sure we are in the selected state; use lite select
      // folder so performance won't suffer.
      rv = imapService->LiteSelectFolder(srcFolder, srcListener, nullptr, nullptr);
      NS_ENSURE_SUCCESS(rv, rv);
      if (deletedMsgs)
      {
        rv = imapService->SubtractMessageFlags(srcFolder,
                                               srcListener, nullptr,
                                               m_srcMsgIdString,
                                               kImapMsgDeletedFlag,
                                               m_idsAreUids);
      }
      else
      {
        rv = imapService->AddMessageFlags(srcFolder,
                                          srcListener, nullptr, m_srcMsgIdString,
                                          kImapMsgDeletedFlag, m_idsAreUids);
      }
    }
  }
  if (!m_dstMsgIdString.IsEmpty())
  {
    nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
    if (NS_FAILED(rv) || !dstFolder) return rv;

    nsCOMPtr<nsIUrlListener> dstListener;

    dstListener = do_QueryInterface(dstFolder, &rv); 
    NS_ENSURE_SUCCESS(rv, rv);
    // ** make sure we are in the selected state; use lite select
    // folder so we won't hit performance hard
    rv = imapService->LiteSelectFolder(dstFolder, dstListener, nullptr, nullptr);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = imapService->SubtractMessageFlags(dstFolder,
                                           dstListener, nullptr,
                                           m_dstMsgIdString,
                                           kImapMsgDeletedFlag,
                                           m_idsAreUids);
    NS_ENSURE_SUCCESS(rv, rv);
    nsMsgImapDeleteModel deleteModel;
    rv = GetImapDeleteModel(dstFolder, &deleteModel);
    if (NS_FAILED(rv) || deleteModel == nsMsgImapDeleteModels::MoveToTrash)
    {
      rv = imapService->GetHeaders(dstFolder, dstListener, 
                                   nullptr, m_dstMsgIdString, true);
    }
  }
  return rv;
}

nsresult
nsImapMoveCopyMsgTxn::SetCopyResponseUid(const char* aMsgIdString)
{
  if (!aMsgIdString) return NS_ERROR_NULL_POINTER;
  m_dstMsgIdString = aMsgIdString;
  if (m_dstMsgIdString.Last() == ']')
  {
    int32_t len = m_dstMsgIdString.Length();
    m_dstMsgIdString.SetLength(len - 1);
  }
  return NS_OK;
}

nsresult
nsImapMoveCopyMsgTxn::GetSrcKeyArray(nsTArray<nsMsgKey>& srcKeyArray)
{
    srcKeyArray = m_srcKeyArray;
    return NS_OK;
}

nsresult
nsImapMoveCopyMsgTxn::AddDstKey(nsMsgKey aKey)
{
    if (!m_dstMsgIdString.IsEmpty())
        m_dstMsgIdString.Append(",");
    m_dstMsgIdString.AppendInt((int32_t) aKey);
    return NS_OK;
}

nsresult
nsImapMoveCopyMsgTxn::UndoMailboxDelete()
{
    nsresult rv = NS_ERROR_FAILURE;
    // ** jt -- only do this for mailbox protocol
    if (m_srcIsPop3)
    {
        nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
        if (NS_FAILED(rv) || !srcFolder) return rv;

        nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
        if (NS_FAILED(rv) || !dstFolder) return rv;

        nsCOMPtr<nsIMsgDatabase> srcDB;
        nsCOMPtr<nsIMsgDatabase> dstDB;
        rv = srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
        if (NS_FAILED(rv)) return rv;
        rv = dstFolder->GetMsgDatabase(getter_AddRefs(dstDB));
        if (NS_FAILED(rv)) return rv;
        
        uint32_t count = m_srcKeyArray.Length();
        uint32_t i;
        nsCOMPtr<nsIMsgDBHdr> oldHdr;
        nsCOMPtr<nsIMsgDBHdr> newHdr;
        for (i = 0; i < count; i++)
        {
            oldHdr = m_srcHdrs[i];
            NS_ASSERTION(oldHdr, "fatal ... cannot get old msg header\n");
            rv = srcDB->CopyHdrFromExistingHdr(m_srcKeyArray[i],
                                               oldHdr,true,
                                               getter_AddRefs(newHdr));
            NS_ASSERTION(newHdr, "fatal ... cannot create new header\n");

            if (NS_SUCCEEDED(rv) && newHdr)
            {
                if (i < m_srcSizeArray.Length())
                    newHdr->SetMessageSize(m_srcSizeArray[i]);
                srcDB->UndoDelete(newHdr);
            }
        }
        srcDB->SetSummaryValid(true);
        return NS_OK; // always return NS_OK
    }
    else
    {
        rv = NS_ERROR_FAILURE;
    }
    return rv;
}


nsresult
nsImapMoveCopyMsgTxn::RedoMailboxDelete()
{
    nsresult rv = NS_ERROR_FAILURE;
    if (m_srcIsPop3)
    {
        nsCOMPtr<nsIMsgDatabase> srcDB;
        nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
        if (NS_FAILED(rv) || !srcFolder) return rv;
        rv = srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
        if (NS_SUCCEEDED(rv))
        {
            srcDB->DeleteMessages(m_srcKeyArray.Length(), m_srcKeyArray.Elements(), nullptr);
            srcDB->SetSummaryValid(true);
        }
        return NS_OK; // always return NS_OK
    }
    else
    {
        rv = NS_ERROR_FAILURE;
    }
    return rv;
}

nsresult nsImapMoveCopyMsgTxn::GetImapDeleteModel(nsIMsgFolder *aFolder, nsMsgImapDeleteModel *aDeleteModel)
{
  nsresult rv;
  nsCOMPtr<nsIMsgIncomingServer> server;
  if (!aFolder)
    return NS_ERROR_NULL_POINTER;
  rv = aFolder->GetServer(getter_AddRefs(server));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIImapIncomingServer> imapServer = do_QueryInterface(server, &rv);
  if (NS_SUCCEEDED(rv) && imapServer)
   rv = imapServer->GetDeleteModel(aDeleteModel);
  return rv;
}

NS_IMETHODIMP nsImapMoveCopyMsgTxn::OnStartRunningUrl(nsIURI *aUrl)
{
  return NS_OK;
}

NS_IMETHODIMP nsImapMoveCopyMsgTxn::OnStopRunningUrl(nsIURI *aUrl, nsresult aExitCode)
{
  nsCOMPtr<nsIUrlListener> urlListener = do_QueryReferent(m_onStopListener);
  if (urlListener)
    urlListener->OnStopRunningUrl(aUrl, aExitCode);

  nsCOMPtr<nsIImapUrl> imapUrl = do_QueryInterface(aUrl);
  if (imapUrl)
  {
    nsresult rv;
    nsCOMPtr<nsIImapService> imapService = do_GetService(NS_IMAPSERVICE_CONTRACTID, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    nsImapAction imapAction;
    imapUrl->GetImapAction(&imapAction);
    nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    if (imapAction == nsIImapUrl::nsImapSubtractMsgFlags)
    {
      int32_t extraStatus;
      imapUrl->GetExtraStatus(&extraStatus);
      if (extraStatus != nsIImapUrl::ImapStatusNone)
      {
        // If subtracting the deleted flag didn't work, try
        // moving the message back from the target folder to the src folder
        if (!m_dstMsgIdString.IsEmpty())
          imapService->OnlineMessageCopy(dstFolder,
                                         m_dstMsgIdString,
                                         srcFolder,
                                         true,
                                         true,
                                         nullptr, /* listener */
                                         nullptr,
                                         nullptr,
                                         nullptr);
        else
        {
          // server doesn't support COPYUID, so we're going to update the dest
          // folder, and when that's done, use the db to find the messages
          // to move back, looking them up by message-id.
          nsCOMPtr<nsIMsgImapMailFolder> imapDest = do_QueryInterface(dstFolder);
          if (imapDest)
            imapDest->UpdateFolderWithListener(nullptr, this);
        }
      }
      else if (!m_dstMsgIdString.IsEmpty())
      {
        nsCOMPtr<nsIUrlListener> dstListener;

        dstListener = do_QueryInterface(dstFolder, &rv);
        NS_ENSURE_SUCCESS(rv, rv);
        // ** make sure we are in the selected state; use lite select folder
        // so we won't potentially download a bunch of headers.
        rv = imapService->LiteSelectFolder(dstFolder, dstListener, nullptr, nullptr);
        NS_ENSURE_SUCCESS(rv, rv);
        rv = imapService->AddMessageFlags(dstFolder, dstListener,
                                          nullptr, m_dstMsgIdString,
                                          kImapMsgDeletedFlag, m_idsAreUids);
      }
    }
    else if (imapAction == nsIImapUrl::nsImapSelectFolder)
    {
      // Now we should have the headers from the dest folder.
      // Look them up and move them back to the source folder.
      uint32_t count = m_srcMessageIds.Length();
      uint32_t i;
      nsCString messageId;
      nsTArray<nsMsgKey> dstKeys;
      nsCOMPtr<nsIMsgDatabase> destDB;
      nsCOMPtr<nsIMsgDBHdr> dstHdr;

      rv = dstFolder->GetMsgDatabase(getter_AddRefs(destDB));
      NS_ENSURE_SUCCESS(rv, rv);
      for (i = 0; i < count; i++)
      {
        rv = destDB->GetMsgHdrForMessageID(m_srcMessageIds[i].get(), getter_AddRefs(dstHdr));
        if (NS_SUCCEEDED(rv) && dstHdr)
        {
          nsMsgKey dstKey;
          dstHdr->GetMessageKey(&dstKey);
          dstKeys.AppendElement(dstKey);
        }
      }
      if (dstKeys.Length())
      {
        nsAutoCString uids;
        nsImapMailFolder::AllocateUidStringFromKeys(dstKeys.Elements(), dstKeys.Length(), uids);
        rv = imapService->OnlineMessageCopy(dstFolder, uids, srcFolder,
                                            true, true, nullptr,
                                            nullptr, nullptr, nullptr);
      }
    }
  }
  return NS_OK;
}

nsImapOfflineTxn::nsImapOfflineTxn(nsIMsgFolder* srcFolder, nsTArray<nsMsgKey>* srcKeyArray,
                                   const char *srcMsgIdString, nsIMsgFolder* dstFolder,
                                   bool isMove, nsOfflineImapOperationType opType,
                                   nsCOMArray<nsIMsgDBHdr> &srcHdrs)
{
  Init(srcFolder, srcKeyArray, srcMsgIdString, dstFolder, true,
       isMove);

  m_opType = opType;
  m_flags = 0;
  m_addFlags = false;
  if (opType == nsIMsgOfflineImapOperation::kDeletedMsg)
  {
    nsCOMPtr<nsIMsgDatabase> srcDB;
    nsCOMPtr<nsIDBFolderInfo> folderInfo;

    nsresult rv = srcFolder->GetDBFolderInfoAndDB(getter_AddRefs(folderInfo), getter_AddRefs(srcDB));
    if (NS_SUCCEEDED(rv) && srcDB)
    {
      nsMsgKey pseudoKey;
      nsCOMPtr <nsIMsgDBHdr> copySrcHdr;

      // Imap protocols have conflated key/UUID so we cannot use
      // auto key with them.
      nsCString protocolType;
      srcFolder->GetURI(protocolType);
      protocolType.SetLength(protocolType.FindChar(':'));
      for (int32_t i = 0; i < srcHdrs.Count(); i++)
      {
        if (protocolType.EqualsLiteral("imap"))
        {
          srcDB->GetNextPseudoMsgKey(&pseudoKey);
          pseudoKey--;
        }
        else
        {
          pseudoKey = nsMsgKey_None;
        }
        rv = srcDB->CopyHdrFromExistingHdr(pseudoKey, srcHdrs[i], false, getter_AddRefs(copySrcHdr));
        if (NS_SUCCEEDED(rv))
        {
          copySrcHdr->GetMessageKey(&pseudoKey);
          m_srcHdrs.AppendObject(copySrcHdr);
        }
        m_dupKeyArray[i] = pseudoKey;
      }
    }
  }
  else
    m_srcHdrs.AppendObjects(srcHdrs);
}

nsImapOfflineTxn::~nsImapOfflineTxn()
{
}

// Open the database and find the key for the offline operation that we want to
// undo, then remove it from the database, we also hold on to this
// data for a redo operation.
NS_IMETHODIMP nsImapOfflineTxn::UndoTransaction(void)
{
  nsresult rv;

  nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
  if (NS_FAILED(rv) || !srcFolder) 
    return rv;
  nsCOMPtr <nsIMsgOfflineImapOperation> op;
  nsCOMPtr <nsIDBFolderInfo> folderInfo;
  nsCOMPtr <nsIMsgDatabase> srcDB;
  nsCOMPtr <nsIMsgDatabase> destDB;

  rv = srcFolder->GetDBFolderInfoAndDB(getter_AddRefs(folderInfo), getter_AddRefs(srcDB));
  NS_ENSURE_SUCCESS(rv, rv);

  switch (m_opType)
  {
    case nsIMsgOfflineImapOperation::kMsgMoved:
    case nsIMsgOfflineImapOperation::kMsgCopy:
    case nsIMsgOfflineImapOperation::kAddedHeader:
    case nsIMsgOfflineImapOperation::kFlagsChanged:
    case nsIMsgOfflineImapOperation::kDeletedMsg:
    {
      if (m_srcHdrs.IsEmpty())
      {
        NS_ASSERTION(false, "No msg header to apply undo.");
        break;
      }
      nsCOMPtr<nsIMsgDBHdr> firstHdr = m_srcHdrs[0];
      nsMsgKey hdrKey;
      firstHdr->GetMessageKey(&hdrKey);
      rv = srcDB->GetOfflineOpForKey(hdrKey, false, getter_AddRefs(op));
      bool offlineOpPlayedBack = true;
      if (NS_SUCCEEDED(rv) && op)
      {
        op->GetPlayingBack(&offlineOpPlayedBack);
        srcDB->RemoveOfflineOp(op);
        op = nullptr;
      }
      if (!WeAreOffline() && offlineOpPlayedBack)
      {
        // couldn't find offline op - it must have been played back already
        // so we should undo the transaction online.
        return nsImapMoveCopyMsgTxn::UndoTransaction();
      }

      if (!firstHdr)
        break;
      nsMsgKey msgKey;
      if (m_opType == nsIMsgOfflineImapOperation::kAddedHeader)
      {
        for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
        {
          m_srcHdrs[i]->GetMessageKey(&msgKey);
          nsCOMPtr<nsIMsgDBHdr> mailHdr;
          rv = srcDB->GetMsgHdrForKey(msgKey, getter_AddRefs(mailHdr));
          if (mailHdr)
            srcDB->DeleteHeader(mailHdr, nullptr, false, false);
        }
        srcDB->Commit(true);
      }
      else if (m_opType == nsIMsgOfflineImapOperation::kDeletedMsg)
      {
        for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
        {
          nsCOMPtr<nsIMsgDBHdr> undeletedHdr = m_srcHdrs[i];
          m_srcHdrs[i]->GetMessageKey(&msgKey);
          if (undeletedHdr)
          {
            nsCOMPtr<nsIMsgDBHdr> newHdr;
            srcDB->CopyHdrFromExistingHdr (msgKey, undeletedHdr, true, getter_AddRefs(newHdr));
          }
        }
        srcDB->Close(true);
        srcFolder->SummaryChanged();
      }
      break;
    }
    case nsIMsgOfflineImapOperation::kMsgMarkedDeleted:
      {
        nsMsgKey msgKey;
        for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
        {
          m_srcHdrs[i]->GetMessageKey(&msgKey);
          srcDB->MarkImapDeleted(msgKey, false, nullptr);
        }
      }
      break;
    default:
      break;
  }
  srcDB->Close(true);
  srcFolder->SummaryChanged();
  return NS_OK;
}

NS_IMETHODIMP nsImapOfflineTxn::RedoTransaction(void)
{
  nsresult rv;
  
  nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
  if (NS_FAILED(rv) || !srcFolder) 
    return rv;
  nsCOMPtr <nsIMsgOfflineImapOperation> op;
  nsCOMPtr <nsIDBFolderInfo> folderInfo;
  nsCOMPtr <nsIMsgDatabase> srcDB;
  nsCOMPtr <nsIMsgDatabase> destDB;
  rv = srcFolder->GetDBFolderInfoAndDB(getter_AddRefs(folderInfo), getter_AddRefs(srcDB));
  NS_ENSURE_SUCCESS(rv, rv);

  switch (m_opType)
  {
  case nsIMsgOfflineImapOperation::kMsgMoved:
  case nsIMsgOfflineImapOperation::kMsgCopy:
    for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
    {
      nsMsgKey hdrKey;
      m_srcHdrs[i]->GetMessageKey(&hdrKey);
      rv = srcDB->GetOfflineOpForKey(hdrKey, false, getter_AddRefs(op));
      if (NS_SUCCEEDED(rv) && op)
      {
        nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
        if (dstFolder)
        {
          nsCString folderURI;
          dstFolder->GetURI(folderURI);

          if (m_opType == nsIMsgOfflineImapOperation::kMsgMoved)
            op->SetDestinationFolderURI(folderURI.get()); // offline move
          if (m_opType == nsIMsgOfflineImapOperation::kMsgCopy)
          {
            op->SetOperation(nsIMsgOfflineImapOperation::kMsgMoved);
            op->AddMessageCopyOperation(folderURI.get()); // offline copy
          }
          dstFolder->SummaryChanged();
        }
      }
      else if (!WeAreOffline())
      {
        // couldn't find offline op - it must have been played back already
        // so we should redo the transaction online.
        return nsImapMoveCopyMsgTxn::RedoTransaction();
      }
    }
    break;
  case nsIMsgOfflineImapOperation::kAddedHeader:
    {
      nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
      rv = srcFolder->GetDBFolderInfoAndDB(getter_AddRefs(folderInfo), getter_AddRefs(destDB));
      NS_ENSURE_SUCCESS(rv, rv);
      for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
      {
        nsCOMPtr<nsIMsgDBHdr> restoreHdr;
        nsMsgKey msgKey;
        m_srcHdrs[i]->GetMessageKey(&msgKey);
        destDB->CopyHdrFromExistingHdr (msgKey, m_srcHdrs[i], true, getter_AddRefs(restoreHdr));
        rv = destDB->GetOfflineOpForKey(msgKey, true, getter_AddRefs(op));
        if (NS_SUCCEEDED(rv) && op)
        {
          nsCString folderURI;
          srcFolder->GetURI(folderURI);
          op->SetSourceFolderURI(folderURI.get());
        }
      }
      dstFolder->SummaryChanged();
      destDB->Close(true);
    }
    break;
  case nsIMsgOfflineImapOperation::kDeletedMsg:
    for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
    {
      nsMsgKey msgKey;
      m_srcHdrs[i]->GetMessageKey(&msgKey);
      srcDB->DeleteMessage(msgKey, nullptr, true);
    }
    break;
  case nsIMsgOfflineImapOperation::kMsgMarkedDeleted:
    for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
    {
      nsMsgKey msgKey;
      m_srcHdrs[i]->GetMessageKey(&msgKey);
      srcDB->MarkImapDeleted(msgKey, true, nullptr);
    }
    break;
  case nsIMsgOfflineImapOperation::kFlagsChanged:
    for (int32_t i = 0; i < m_srcHdrs.Count(); i++)
    {
      nsMsgKey msgKey;
      m_srcHdrs[i]->GetMessageKey(&msgKey);
      rv = srcDB->GetOfflineOpForKey(msgKey, true, getter_AddRefs(op));
      if (NS_SUCCEEDED(rv) && op)
      {
        imapMessageFlagsType newMsgFlags;
        op->GetNewFlags(&newMsgFlags);
        if (m_addFlags)
          op->SetFlagOperation(newMsgFlags | m_flags);
        else
          op->SetFlagOperation(newMsgFlags & ~m_flags);
      }
    }
    break;
  default:
    break;
  }
  srcDB->Close(true);
  srcDB = nullptr;
  srcFolder->SummaryChanged();
  return NS_OK;
}